water storage
Yup, about as simple as you can get.
you can use heavy rotating mass as well
Very few people listened when I said Liquid Organic Hydrogen Storage, but finally people are starting to do so.
Soon you will see these plants everywhere taking excess energy splitting it into hydrogen and storing it in a stable at normal temperature liquid form
https://www.hydrogen.energy.gov/pdfs/07-Schmidt-Liquid%20Organic%20Hydrogen%20Carriers.pdf
“stable at normal temperature liquid form”
Stable be the key word. I’ve worked with the gas and it scared me.
Liquid Organic Hydrogen Storage
Is that anything like, say, oil?